低渗岩性油藏油井生产模式与产能主控因素研究

文章摘要

低渗岩性油藏油井生产模式与产能主控因素研究

Well production modes and control-factors of low-permeability lithologic reservoir: A case study

投稿时间：2020-05-20 修订日期：2020-05-20

DOI：

中文关键词: 低渗透岩性油藏油井产能主控因素渗流屏障

英文关键词: Low-permeability lithologic reservoir productivity control-factors seepage barrier

基金项目:中石油科技攻关项目“复杂断块岩性油藏提高水驱开发效果技术”(P2016-032)；四川省援疆计划重点项目“岩性油藏储层评价与有利区预测”(FS2017-251)

作者	单位	邮编
段波龙^*	中国石油新疆油田分公司陆梁油田作业区	834000

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中文摘要:

我国陆上油藏以陆相沉积为主,受沉积特征影响岩性油藏普遍存在。低渗岩性油藏的油井产能受岩性、物性、注采关系等多重因素影响,理清产能主控因素有助于科学指导油田制定合理的开发技术政策。本文以夏盐11井区三工河组低渗透岩性油藏为例,研究了油井生产模式和产能主控因素。研究结果表明,低渗透岩性油藏油井表现出五种生产模式,高产含水缓慢上升型、高产含水突进型、中产含水缓慢上升型、中产含水突进型、低产高含水型；油井产能受构造形态影响小,岩性、物性是影响产能的关键因素,其中80%产量由占比不到50%的较大孔隙贡献；受不同岩性之间渗流屏障作用的影响,油水井以不同岩性砂岩连通时,见效时间长,含水上升缓慢,反之,油井产量高,见效明显,但是见水后含水急剧上升；渗流屏障起到了延缓水驱突破时间和类似深部调驱扩大水驱波及体积的作用,利用好不同岩性之间的渗流屏障,有利于提高水驱采收率。

英文摘要:

Most of the China"s onshore reservoirs are terrestrial sediments. Due to the sedimentary characteristics, lithologic reservoirs are widespread. The productivity of oil wells in low-permeability lithologic reservoirs is affected by multiple factors such as lithology, physical properties, and injection-production relationships (IPRS). Clarifying the main control-factors of productivity can help scientifically make the reasonable development policies. In this paper, the low-permeability lithologic reservoir of Sangonghe Formation in Xiayan 11 well block is taken as an example to study the production mode and the main control-factors of productivity. The results show that low-permeability lithologic oil reservoirs exhibit five production modes; the weak relationships between structure and productivity, lithology and physical properties are the key factors affecting productivity, 80% of the oil production is contributed by larger pores that account for less than 50%; affected by the seepage barrier between different lithologies, oil and water wells are connected by different lithological sandstones, the effect time is long, the water cut rises slowly, on the contrary, the oil well production is high, and the effect is obvious, but the water cut rises sharply after the water breakthrough; the seepage barrier plays a role in delaying the breakthrough time of water flooding and expanding the volume of water flooding which is similar to the deep profile flooding, reasonable using the seepage barrier is conducive to improving waterflood recovery.

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